Difference Between Call by Reference and Call by Value in PHP
by TechVidvan Team
Program 1
<html>
<head><title>Demo</title></head>
<body>
<center>
<?php
function swap(&$a,&$b) //call by reference
{
$c=$a;
$a=$b;
$b=$c;
}
$a=500;
$b=300;
echo "Value is : ".$a;
// echo "<br>Before Swaping: ".$a." ".$b;
// swap($a,$b);
// echo "<br>After Swaping: ".$a." ".$b;
// $a=500;
// $b=&$a;
// echo "a=".$a."<br>";
// echo "b=".$b."<br>";
// $b=1500;
// echo "a=".$a."<br>";
// echo "b=".$b."<br>";
// $a=$a+1000;
// echo "a=".$a."<br>";
// echo "b=".$b."<br>";
?>
</center>
</body>
</html>Program 2
<html>
<head><title>Demo clone</title></head>
<body>
<center>
<?php
class employee
{
public $name;
public $department;
public function __construct($ename)
{
$this->name=$ename;
}
}
$e1=new employee("Vishal Verma");
$e2=clone $e1;
echo "e1=".$e1->name."<br>";
echo "e2=".$e2->name."<br>";
$e2->name="Ashok Gupta";
echo "<br>----After Change Name---------<br>";
echo "e1=".$e1->name."<br>";
echo "e2=".$e2->name."<br>";
?>
</center>
</body>
</html>
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TechVidvan Team
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